pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-13-1-9 Articles Effect of peanut mottle virus on reaction of peanut cv. Tamnut 74 to Cercospora arachidicola H. A. Melouk 1 and J. L. Sherwood 2 USDA, ARS, Oklahoma State University, Stillwater, Oklahoma 74078 Department of Plant Pathology, Oklahoma State University, Stillwater, Oklahoma 74078

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 1 1986 13 1 31 33 17 5 1986 American Peanut Research and Education Society 1986 American Peanut Research and Education Society Abstract

Two-week old seedlings of Tamnut 74 peanut were inoculated with peanut mottle virus (PMV) or left nontreated, and four weeks later were sprayed with a conidial suspension of Cercospora arachidicola (2 × 104 conidia/mL) prior to placement in a polyethylene enclosure in a growth chamber (22–30 C, 100% RH). After three weeks, number of lesions/leaflet, leaflet area (mm2), necrotic area (mm2)/leaflet, percent necrotic area, conidial density (conidia/mm2) of necrotic area), and conidia/leaflet, was determined on four leaflets for each of 12 PMV-infected and 12 virus-free plants. Conidia/leaflet (one important parameter in evaluating reaction of peanut genotypes to C. arachidicola), lesions/leaflet, area of lesion, and leaflet area was reduced on PMV-infected plants compared to virus-free plants in each of 4 experiments. Similarly, necrotic area/leaflet were reduced in 3 of 4 experiments. Conidia/mm2 of necrotic area was reduced in 2 of 4 experiments. PMV was not detected in conidia of C. arachidicola from PMV infected plants by inoculation to a PMV indicator host, serology, electron microscopy or electrophoresis.

 Key Words Peanut mottle virus interaction; , Arachis hypogaea; , reaction evaluations